Methods and apparatus for a polarizing image sensor
Various embodiments of the present technology may comprise a method and apparatus for a polarizing filter. The polarizing filter may be formed such that the filter has varying polarization axes for blocking reflected light emitted from various directions. The method and apparatus may utilize metal wires or molecular chains to form curved lines across the filter, where the curved lines define the polarization axes.
1. A polarizing image sensor, comprising:
a pixel array comprising photosensitive elements; and
a polarizing filter positioned adjacent to a major surface of at least a portion of the pixel array, wherein the polarizing filter comprises a plurality of ridge structures, wherein each ridge structure, from the plurality of ridge structures, is arranged in an arc shape that extends in a horizontal direction from a first edge of the pixel array to an opposing second edge of the pixel array, and the plurality of ridge structures are spaced substantially equidistant from one another.
2. The polarizing image sensor of claim 1 , wherein the plurality of ridge structures comprises aluminum.
3. The polarizing image sensor of claim 1 , wherein each of the ridge structures comprises a continuous wire.
4. The polarizing image sensor of claim 1 , further comprising a microlens array disposed adjacent to the polarizing filter, wherein the polarizing filter is positioned between the microlens array and the pixel array.
5. The polarizing image sensor of claim 1 , further comprising a microlens array disposed adjacent to the polarizing filter, wherein the microlens array is positioned between the polarizing filter and the pixel array.
6. The polarizing image sensor of claim 1 , further comprising a microlens array and a color filter array, wherein the polarizing filter is disposed in between the microlens array and the color filter.
7. The polarizing image sensor of claim 1 , further comprising:
a microlens array; and
a color filter array, wherein the color filter array is positioned between the microlens array and the polarizing filter.
8. The polarizing image sensor of claim 1 , wherein the polarizing filter further comprises a plurality of polarization axes of varying degrees and perpendicular to the ridge structures.
9. A method for forming a polarizing image sensor, comprising:
forming an array of photosensitive elements in a substrate; and
forming a plurality of metal ridge structures adjacent to the substrate to cover a bottom-half portion of the array, wherein the plurality of metal ridge structures are arranged in an arc shape that extends in a horizontal direction from a first edge of the pixel array to an opposing second edge of the pixel array and spaced substantially equidistant from one another.
10. The method of claim 9 , wherein the arc shape is selected to attenuate light from various reflection angles.
11. The method of claim 10 , further comprising forming a microlens array and a color filter array on at least the plurality of metal ridge structures.
12. An imaging system, comprising:
a processing unit;
a memory device coupled to the processing unit;
a pixel array coupled to the processing unit and having a plurality of photosensitive elements; and
a polarizing filter positioned adjacent to a major surface of the pixel array and overlapping only a bottom-half of the pixel array, wherein the polarizing filter comprises a plurality of metal wires, wherein each metal wire is arranged in an arc shape that extends in a horizontal direction from a first end of the pixel array to a second end of the pixel array, and wherein the plurality of metal wires are spaced substantially equidistant from one another.
13. The imaging system of claim 12 , wherein the polarizing filter is disposed along a bottom portion of the pixel array.
14. The imaging system of claim 12 , further comprising a microlens array disposed above the polarizing filter.
15. The imaging system of claim 12 , further comprising a color filter array disposed above the polarizing filter.
16. The imaging system of claim 12 , further comprising a microlens array disposed below the polarizing filter.
17. The imaging system of claim 12 , further comprising a microlens array and a color filter array, wherein the polarizing filter is disposed in between the microlens array and the color filter.
18. The imaging system of claim 12 , further comprising a microlens array and a color filter array, wherein the color filter array is disposed in between the microlens array and the polarizing filter.
19. The imaging system of claim 12 , wherein the plurality of metal wires comprises aluminum.
20. The imaging system of claim 12 , wherein the polarizing filter further comprises a plurality of polarization axes of varying degrees and perpendicular to the ridge structures.